Lydia guessed there were 180 jelly beans in a container. There were actually 220 jelly beans in the container. What was Lydia's percent error? (solve the same way as percent of change but the actual amount is the denominator)

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex